Sorry...can't help but just wanted to let you know, you are not alone!!
We're running the Linysys and the desktop is usually getting knocked off but yesterday it was the laptop too. I've been told it may be because of the walls (CBC) but it's very annoying.
If you had spilled Coke on it in the past, CRB, or the modem, and it blew out connections, maybe get a new router. I do unplug my router and replug about once a week, though am not getting disconnected, just slow.
Ours does the same thing. It really is annoying isn't it? Especially since we have over $200 in the system. We just upgraded to the Linksys Wireless - G. If I had my way, I'd take it back. Worthless pretty much sums it up.